1) If an irregularly shaped object (such as a wrench) is dropped from rest in a classroom and feels no air resistance, it will
A) accelrate and turn about its center of gravity with uniform angular accelration.
B) accelrate and spin until its center of gravity reaches its highest point.
C) accelrate and turn until its center of gravity reaches its lowest point.
D) accelrate and turn about its center of gravity with uniform angular speed.
E) accelerate but will not spin.
2) A solid sphere, soild cylinder, and a hollow pipe all have equal masses and radii and are of uniform density. If the three are released simultaneously at the top of an inclinded plane and roll without slipping, which one will the bottom first?
A) Solid cylinder
B) Solid sphere
C) hollow pipe
D) They all reach the bottom at the same time.
3) A horizontal disk rotates about a vertical axis through its center. Point P is midway between center and the rim of the disk, and point Q is on the rim. If the disks turns with constant angular velocity, which of the following statements about it is true?
A) The angular velocity of Q is twice as great as the angular velocity of P.
B) The linear accelration of P is twice as great as the linear acceleration of Q.
C) P and Q have the same linear acceleration.
D) The linear accelration of Q is twice as great as the linear accelration of P.
4) A piece of thin uniform wire of mass m and length 3b is bent into an equilaeral triangle. Find the moment of inertia of the wire triangle about an axis perpendicular to the plane of the triangle and passing through one of its vertices.
A) 7/12 mb^2 B)1/3 mb^2 C) 1/2 mb^2 D) 2/3 mb^2 E) 7/4 mb^2